Sunday, November 27, 2011

Osseous Tissue (Bone)

The bone tissue, also known as osseous tissue, is the forming component of the skeletal system. It protects inner body cavities and provides movement, as a lever, by converting muscle contractions into movements; another important function of the bone tissue is blood cell formation and storing minerals like calcium. The bone tisue consists of cells, which are called osteoblasts, and an extracellular matrix in which fibers are embedded; it is unlike other connective tissues in that the extracellular matrix becomes calcified. There are two types of bone tissue: 1) spongy bone, which is composed of a network of branching bone spicules or trabeculae, with spaces between them containing bone marrow; 2) compact bone, which appears as a mass of bony tissue lacking spaces visible to the unaided eye.